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3-40

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ID = 17930
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Current Regulator, Iron in Hydrogen   Power-supply 
Identical to 3-40
Similar Tubes
Other characteristic (electr. data):
  220_Ballast

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=B)
Filament
Description

Also called "Amperite Type 3.40 in Rider's Lafayette 7-5. Here it is used for 105 - 120 volts and has to be changed for Amperite type 220 for 220 volt operation.

 
Text in other languages (may differ)
Information source Taschenbuch zum Röhren-Codex 1948/49   

0_ball_6_28.png 3-40
Emilio Ciardiello


Just Qvigstad
Usage in Models 2= 1934 ; 1= 1935?? ; 2= 1935

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):5

Collection of

 
20200703_150052.jpg

 

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